DEBIAN-CVE-2026-48104
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-48104
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48104.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-48104
- Upstream
- Published
- 2026-06-05T17:16:48Z
- Modified
- 2026-09-14T17:03:41Z
- Severity
-
- 4.2 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L CVSS Calculator
- Summary
- [none]
- Details
-
7-Zip is a file archiver with a high compression ratio. Versions 9.18 through 26.00 contain an uninitialized heap read in the SquashFS archive handler caused by a sparsely populated index array. In the SquashFS handler, _blockToNode is allocated with capacity for every metadata block but populated only when an inode crosses a block boundary, so a crafted image with few inodes spanning many blocks leaves most slots holding raw heap contents (the underlying allocator does not zero-initialize POD storage). When OpenDir looks up an attacker-influenced blockIndex (derived from the RootInode superblock field), it reads two of these uninitialized slots and passes them as the left/right bounds of a binary search over _nodesPos, which dereferences the midpoint without bounds checking; if the resulting value happens to match the search key, the returned index is used to read a full node struct from _nodes whose fields feed further directory parsing, forming a chained OOB read primitive that is heap-layout-dependent and not reliably triggerable. The SquashFS handler is enabled by default in stock 7z.dll and the issue triggers during Open() with no interaction beyond opening the file; impact is denial of service from wild-pointer dereference and potential heap information disclosure, with no write primitive. Version 26.01 fixes the issue.
- References
Affected packages
Debian:12 / 7zip
Package
- Name
- 7zip
- Purl
- pkg:deb/debian/7zip?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed22.01+really26.01+dfsg-0+deb12u1
Debian:13 / 7zip
Package
- Name
- 7zip
- Purl
- pkg:deb/debian/7zip?arch=source&distro=trixie
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Affected versions
24.*
25.*
26.*
Debian:14 / 7zip
Package
- Name
- 7zip
- Purl
- pkg:deb/debian/7zip?arch=source&distro=forky
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed26.01+dfsg-1
Affected versions
24.*
25.*
26.*
Debian:12 / p7zip
Package
- Name
- p7zip
- Purl
- pkg:deb/debian/p7zip?arch=source&distro=bookworm
Debian:13 / p7zip
Package
- Name
- p7zip
- Purl
- pkg:deb/debian/p7zip?arch=source&distro=trixie